> My 1200 petrol car is so quiet you can't actually hear the engine from within the ca Because your car is actually insulated from that noise. Look at every ca

> My 1200 petrol car is so quiet you can't actually hear the engine from within the ca Because your car is actually insulated from that noise. Look at every car review ever and there is a section about noise isolation. Furthermore the sound is also dependent on the length of exhaust - your average car exhausts is longer than a whole bike and for example previously mentioned BMWs wriggle it around the whole engine back and forth just for that reason. This comes at the price of weight and thus handling/fuel efficiency and actual pollution.